Google Voice now offers a timed "Do Not Disturb" function that sends callers straight to voicemail when you want a little time to yourself.

The easiest way to activate Voice's no-calls-please mode is through the Calls sub-menu of your Settings from your web inbox, though you can also call your own voicemail number and set it up there. In either option, you're allowed to set up the number of minutes, hours, or days you want callers to head straight into voicemail. Nice for setting up mini-vacations without recording a new message, and dummy-proofing situations where you really don't want any rings. [Google Voice Blog]